State some example of security attacks?

      1.Gain unauthorized access to information(ie.violate secrecy or privacy)

      2.Disavow responsibility or liability for information the  cheater did originate.

      3.Enlarge cheater’s  legitimate license(for access ,origination, distribution etc).

      4.Pervert the function of software, typically by adding a covert function.

      5.Cause others to violate a protocol by means of introducing incorrect information.